Right now

Temp14°C

Wind13 km/h

Gusts18 km/h

Humidity69.91%

Rain 48hdry

Last rainNone recent

Assessment

No recent rain

Good friction temperature range for rhyolite

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Monday 28 September

Good

Temp14°C

Raindry

Wind10 km/h

Gusts12 km/h

Humidity59%

No recent rain

Good temperature for mountain rhyolite

Time °C Rain Wind (km/h) Gust Hum

15:00 14° dry 10 12 58.69%

18:00 14° dry 13 18 69.91%

21:00 12° dry 12 27 73.41%

Tue Tuesday 29 September

Poor

Temp15°C

Raindry

Wind32 km/h

Gusts63 km/h

Humidity87%

No recent rainWind 32 km/h, gusts 63 km/h — too windyHumidity 87% — potential fog

Good temperature for mountain rhyolite
Damp mountain air — upper pitches may stay greasy
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 10° dry 21 44 95.47%

09:00 12° dry 24 52 95.76%

12:00 14° dry 33 63 90.44%

15:00 17° dry 32 63 84.32%

18:00 18° dry 29 60 81.48%

21:00 18° dry 32 64 82.07%

Wed Wednesday 30 September

Poor

Temp15°C

Rain20mm

Wind27 km/h

Gusts54 km/h

Humidity77%

19.7mm rain forecastWindy — 27 km/h, gusts 54 km/h

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 13° 4mm 16 35 92.74%

09:00 13° 0.8mm 23 45 89.6%

12:00 15° 0.6mm 28 54 76.31%

15:00 15° dry 26 51 77.07%

18:00 13° 1mm 20 39 90.88%

21:00 12° 0.7mm 16 32 95.58%

Thu Thursday 1 October

Poor

Temp12°C

Rain4mm

Wind21 km/h

Gusts41 km/h

Humidity76%

3.6mm rain forecast

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 10° 0.7mm 11 21 94.44%

09:00 10° 0.3mm 15 31 89.15%

12:00 12° 0.5mm 20 41 76.26%

15:00 13° 0.2mm 21 41 74.78%

18:00 12° dry 16 30 85.99%

21:00 11° dry 17 32 91.99%

Fri Friday 2 October

Poor

Temp13°C

Rain7mm

Wind21 km/h

Gusts41 km/h

Humidity86%

7mm rain forecastHumidity 86% — potential fog

Good temperature for mountain rhyolite
Wet rhyolite is slippery; seepage from grass above can linger
Breezy — helps drying

Time °C Rain Wind (km/h) Gust Hum

06:00 11° 2mm 20 38 95.79%

09:00 12° 2mm 19 37 94.44%

12:00 13° 0.5mm 21 40 86.52%

15:00 14° 0.7mm 21 41 85.39%

18:00 13° 0.5mm 14 27 94.39%

21:00 11° dry 12 23 96.83%

Sat Saturday 3 October

Poor

Temp13°C

Rain0.4mm

Wind14 km/h

Gusts27 km/h

Humidity82%

0.4mm rain forecast

Good temperature for mountain rhyolite

Time °C Rain Wind (km/h) Gust Hum

06:00 10° 0.4mm 9 17 97.77%

09:00 11° dry 11 21 91.59%

12:00 13° dry 14 27 82.11%

15:00 14° dry 13 27 81%

18:00 13° dry 9 17 93.36%

21:00 11° dry 8 15 96.39%

Sun Sunday 4 October

Poor

Temp13°C

Rain0.4mm

Wind11 km/h

Gusts23 km/h

Humidity79%

0.4mm rain forecast

Good temperature for mountain rhyolite

Time °C Rain Wind (km/h) Gust Hum

06:00 9° dry 6 13 97.92%

09:00 10° dry 8 17 90.64%

12:00 13° dry 11 23 79.27%

15:00 14° dry 11 22 78.37%

18:00 12° dry 7 13 92.55%

21:00 10° dry 5 10 96.9%

Mon Monday 5 October

Good

Temp14°C

Raindry

Wind11 km/h

Gusts23 km/h

Humidity78%

Should be dry

Good temperature for mountain rhyolite

Time °C Rain Wind (km/h) Gust Hum

06:00 8° dry 6 11 98.33%

09:00 10° dry 7 15 91.02%

12:00 13° dry 11 23 78.89%

15:00 14° dry 11 22 76.57%

About Tryfan (Heather Terrace & Grooved Arete)

Tryfan (Heather Terrace & Grooved Arete) is one of the most iconic mountain venues in Snowdonia, featuring rough, high-friction Ogwen volcanic rock. The dark rock is firm, featured, and offers excellent handholds, though mountain gullies and deep chimneys retain moisture following heavy fell rain. Facing east along the Heather Terrace, the cliff gets early morning sun before falling into shade, while its high mountain altitude over 700 metres exposes it to cold mountain winds. Grade coverage is heavily focused on classic lower-grade traditional scrambles and multi-pitch routes, epitomised by the legendary Grooved Arete. The approach involves a sustained, forty-five minute steep mountain hike from the Ogwen Cottage laybys along A5. Mountain weather changes rapidly at this altitude, making warm clothing, navigation tools, and helmets mandatory.

Region: Snowdonia — Ogwen
Rock type: Rhyolite
Aspect: east-facing
Altitude: 700m
Exposure: high
Seepage: medium

Other crags in this region

Glyder Fach (Main Cliff)Little Tryfan (Tryfan Bach)